@width:100%;

*{
    margin:0;
    padding:0;
}
body{
    background-color:#f2f2f2;
    min-width:320px;
    line-height:1.5;

    @media screen and (min-width:320px){
        body{
            font-size:12px;
        }
    }


    #top{
        position:relative;
        width:375px;
        height:2rem;
        margin:0 auto;

        img{
            display:block;
            width:375px;     
         }
    }

}